Valve grinder



Slept 'M s il. @b-SORT VALVE GRINDER 'Filed April Z50,

Patented Sept. 14, 1926.

UNITED STATES JESSE P. SHORT, F GREENSBURG, INDIANA.

yVALVE GRINDER.

Application filed April 3U, 1923.

My invention relates to improvements in valve grinding tools and it is one of the objects oi my invention to provide a valve grinding tool for grinding the valves of .5 automobile engines and the like, which tool may be easily clamped in position on the motor bloclr of that type of engine which is provided with a removable cylinder head.

Another object of my invention is to provide means for positioning the valve os `'illating member with respect to the valve and n'iaintaining it in its position so that the valve will be truly centered. Other objects and advantages ot my invention will appear more fully in the accompanying spocilication. and claims.

For the purpose oi disclosing my invention I have illustrated certain embodiments thereof in the acsompanying drawings in which- Fig. 1 is a perspective view of my grinding tool mounted in position on the cylinder block;

F ig. 2 is a longitudinal sectional view ot my tool;

Fig. 3 is a sectional view taken on the line 3 8 of Fig. 2;

Fig. 4 is a perspective view oit a moditied form of the valve engaging wrench; and

Fig. 5 is an elevation partly in section of a slightly modified form of my grinding tool.

In the embodiment of my invention illustrated, I provide a tubular standard 1 which is adapted to be secured on the top of the motor block by a clamping screw 2. This screw is threaded at its lower end to engage in the bolt holes which are ordinarily provided tor holding the cylinder head in position on the cylinder block and extends through the standard 1, being provided at its upper end with a hand wheel by which the screw 2 is screwed into the screw hole and between which and the top of the cylinder block the standard 1 is rigidly clamped.

The valve grinding mechanism proper is positioned by this standard 1 and this grinding mechanism comprises a central spindle, or stem, 4 having at its lower end a pin-projection 5 adapted to engage in the centered recess, or socket, of the valve. The spindle, or stem 4 is slidably mounted in a bearing formed at the outer end of an arm 6 extending laterally from the standard 1. This arm, in order to permit of an adjustment of the spindle 4 laterally relatively to the Serial No. 635,493.

standard 1, is preferably formed of two se"- tions, one section 7 being telescoped between a pair of arm sections 8 extending from the standard 1 and slotted to permit the passage therethrough of a clamping bolt 9. The valve oscillating tool comprises a tubular stem 10 having a foot member 11 provided with spaced-apart prongs 12 adapted to engage in the slot formed in the top oi the valve or `in the grinding tool openings formed in the top of the valve. These prongs are spaced apart and are arranged on either side of the projection 5. The stem is also provided with an-oscillating handle 13 and is rotatably mounted upon the spindle 4. It is urged into engagement with the valve by means of a pressure meniber 14 likewise slidably mounted on the spindle 4 and between the lower end ot which and the stem 10 is arranged a coil spring 15 so that as the operator forces the pressure member 14 down the spring 15 will be placed under compression thereby' urging the valve oscillating member into engagement with the valve. This member 14 is provided with a transversely extending slot 16 to accommodate the arm 6 and permit the member 14 to vertically move on said arm.

In order that valves having various types of grinding tool recesses may be operated upon, I may if desired, provide the form ot' an oscillating tool illustrated in Fig. 4. In this type of tool the head 11a `is removably mounted on the tool and may have various types ot valve engaging projections 12a. The tool proper at its lower end is provided with a pair of projections 17 adapted to seat in sockets 18 on the upper face of the head to prevent relative rotation between the stem 10 and the head. The head is held in position by a pair of spring lingers 19 arranged to clamp on either side of the head and provided with inturned lugs 2O arranged to engage beneath the head.

Those tools which are adapted for one specified type of engine need not be provided with the adjustable arm 6 as illustrated in Fig. 2, but as `illustrated in Fig. 5 this arm may be of a standard length and in one piece as shown in Fig. 5.

In operation the standard 1 is clamped on the engine block by means of the screw 2 which engages in the threaded bolt opening of the cylinder head. In most engines these bolt openings are spaced equidistant between two valve openings so that after one valve has been ground the apparatus may be swung to grind a second valve Without removing` the tool. The standard having been securely clamped in position on the engine head, the operator, by compressing the spring l5, may7 raise the head ll'suiiciently beyond the projection so that this projection will be clearly visible and then lower the spindle Lluntil this projection 5 is seated in the center socket of the valve. By exerting pressure upon the upper end ot the pressure member 'lll the spring is suliiciently compressed to 'force the head ll closely into engagen'ient with the valve, with the projections l2 engaging in the tool receiving openings of the valve. The operator may then oscillate the stem l0 on the spindle si by means oiE the handle i3 to properly sea and grind the valve in position.

l. claim as my invention:

l.. in a valve grinder, the combination with a standard arranged to be rigidly mounted on an engine block, oit a spindle arranged to engage the valve and be maintained by said standard in axial alignment With the stem thereof, a Valve oscillating Ymember journaled on said spindle, a pressure member vertically movable on said spindle and a spring interposed between said pressure member and said oscillating member to maintain the oscillating member in engagement with the valve.

2. ln a valve grinder, the combination with a standard arranged to be rigidly mounted on an engine block and having an oiiset bearing in alignment with the valve stem guide, a spindle vertically movable in said bearing and maintained in axial alignment with the valve stem, an operating member oscillating the valve, rotatably mounted on said spindle and vertically movable thereon, a pressure member vertically movable on. said spindle and a coil spring interposed between said pressure member and said valve oscillating member.

In Witness whereof, ll, Jnssn P. Siron'r, liaveliereunto set my hand at Greensburg, indiana, this th day of April, A. D. one thousand nine hundred and twenty-three.

JESSE l). Sli-IOR". 

